Active NPI
Gay D Trepanier, MD
- Geriatric Medicine (Family Medicine) Physician
- Fond Du Lac, WI
National Provider Identifier
1164415709
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Geriatric Medicine (Family Medicine) Physician
- License
- 16852
- Practice address
- 481 E Division St
Suite 100
Fond Du Lac, WI 54935-3748 - Phone
- (920) 929-8120
- Fax
- (920) 929-8126
- NPI assigned
- Aug 30, 2005
- Last updated
- Sep 11, 2025
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Family Medicine Physician | 207Q00000X | 16852 | WI | |
| Geriatric Medicine (Family Medicine) Physician | 207QG0300X | 16852 | WI | Primary |
Addresses
Primary practice location
481 E Division St
Suite 100
Fond Du Lac, WI 54935-3748
Mailing address
481 E Division St
Suite 100
Fond Du Lac, WI 54935-3748
Phone (920) 929-8120
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 31081800 | Medicaid | WI |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 16852 | WI | MD | Family Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Dodge County Medical Facilities | Past | Accepting new patients |
Organizations & group practices 2
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.
-
- Contractor
- Fond Du Lac, WI
- NPI 1467522557
-
- Skilled Nursing Facility
- Juneau, WI
- NPI 1407067945
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1125360000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1164415709",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "481 E DIVISION ST",
"address_2": "SUITE 100",
"city": "FOND DU LAC",
"state": "WI",
"postal_code": "549353748",
"telephone_number": "920-929-8120",
"fax_number": "920-929-8126"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "481 E DIVISION ST",
"address_2": "SUITE 100",
"city": "FOND DU LAC",
"state": "WI",
"postal_code": "549353748",
"telephone_number": "920-929-8120",
"fax_number": "920-929-8126"
}
],
"practiceLocations": [],
"basic": {
"last_name": "TREPANIER",
"first_name": "GAY",
"middle_name": "D",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-08-30",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207Q00000X",
"taxonomy_group": "",
"desc": "Family Medicine",
"state": "WI",
"license": "16852",
"primary": false
},
{
"code": "207QG0300X",
"taxonomy_group": "",
"desc": "Family Medicine, Geriatric Medicine",
"state": "WI",
"license": "16852",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "31081800",
"state": "WI"
}
],
"endpoints": [],
"other_names": []
}Other providers in Fond Du Lac, WI
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.